Fuel burner of the injector type



' July 7, 1.925. v L. GROTE FUEL BURNER 0F THE INJECTOR TYPE 4 sheets-sheet 1 Filed June 5, 1925 NU l ml E y W Y www L /mw July 7, 1925.

L. GROTE FUEL BURNER oF THE INJEcToR TYPE Filed June 5, 1923 4 Sheets-Sheet 2 I'July 7, 1925. f.

L. GRQTE FUEL BURNER OF THE INJECTOR TYPE 4 Sheets-Sheet 5 Filed Jum 5, 192:5

Iflll July 7,' 1925.

L. GRCTE FUEL BURNER 0F THE INJEGTOR TYPE 4 Sheets-Sheet 4 Filed June 5, 1923 Patented July 7, 1925. j Y l. y www LUDWIG eno'rn', I'. o1\TDo1A\TAA ENeLnND, AssIGtIvonv orf onrifrrArtr; To WILLIAM "BEAvANWATIsoN, or LoNDomnNGLAND.

YrUnI.'BURNER or THE INiEC'IoR inizia-3.1"jA f i :.'Appiication mea June 5,1923.,` serial' No:` 4643,530. 'A

'25 ized soiidlfueior-that it To all whomt may concern: v l

Be it known that I, LUDWIG Grno'rn,I a citi.

zenv of Germanyrxresiding. at i ,177 AMount Pleasant Road, Tottenham,"London, VEngv land7 have invented certain new and useful' Improvements Relating to Fuel Burners of they Injector Type,.of which the y.following is a specification. k f i This Iinvention relates to injectortypev and more particularly to such burners of the known types comprisingan elongated barrel lhaving `any suitable'bore l for example a tapering bore widening more or-less regularly towards the nose end ofi-the l burner, and aninjector nozzle locatedicoaxially with the. saidgboreinthe'rear end of saidburner so as to projectair under-apressure along said bore.V .I

It has been proposed to employ burners of V this type for burning: liquidt fuel and means have been proposed to admit such liquid fuel to the bore of said burner at various points. I am not aware however that such burners have ever been employed inburning pulverhas ever been Vproposedso tofuse'them. f f

This pulverulent vcrushed I,or finely divided.. coal, V lignite, brown coal7 coke, peaty'sawdust and the like is cheap and rea-dily o btainablefinone formlor another and the object (inter alia) of my presenti-invention isf toprovide an in'- jector` burner l conforming generally to the aforesaid type but incorporating essential Vmodificationsv and: improvements according to my present,-invention,whfichrender lsaid burneincapableof .being'iused at will for portion of the body Lof the burner-feadyantageously towards the nose end-forming an annular chamber between the j acketand the wall' of the burner,V the incoming air being `burners of the solid" fuel? l such as' passed through said annular heating chamberv and thence conducted to the :injector nozzle, Y f f My improved-burner may {be`provided` with means forsupply'ing combust'ible'gas thereto for a separate supply vofjliquid fuel for use when starti-ngffrom cold for `the pur'- pose of heating the burner. 'l v invention with reference to ing'draWngS, in which: Y

Fig. i ll is 'a longitudinal vertical section ofk I will now more 'fully describe my' present I fheompwy'- f a burner :constructed vaccordingto' this -in-` .o

Yvention.-k .p .p i i i. Fig. Qis a longitudinal sectional view at rightangles to Fig. l taken on line 9&-2 ofl Fig. l, parts being omitted.

Fig. 3 is a cross sectional view on' line'B-S Fig.u2,f1ooking in .the directionfof lthe' ar y "Figa is a verticalsectional viewtaken onf line 4 4 of Fig. Band showing means for supplying the from below. i .1. Fig 5, is a llocalhorizontal sectionof the rear part of the burner illustrating amodilied form' of l injector 1 in. whichv liquid :fuel is aroundthe injector nozzle, whence said-'fuel 'is sucked into the' enlargedchamber ofthe borerbyinjectonjactionu f :1

Fig. 6. 's a vertical sectional view? of means for supplying A'the .liquid 1 fuel .to the f `burner when thefinjector illustra-ted'- 5v is employed. I l

Referring to Figsiltofilris provided with a tapering bore Bnarrowl; ingrearwardly and thenopening outinto an enlargedj'chamber C intozwhich latter V,the

Therear part A of the body ofv the supplied to" Van 'annularA` passage located Qpulv'erulent` fuel is 'drawn through' the.

tapered openings Gland Czby `theinjector action of air deliveredthrough said cham- ,ber C.bywthenozzleDlocated .in a screw `collar D1.' provided with an internal shoulder D2 ,and screwedl intothe rearfwall ofthe chamber@` the-'bore of said nozzleD being. coaxial with the bore B.

A second part'E- of the bodyliportionof theburner is screwed'down against theboss A1 of the pantA, and this second part Ek is of such form lthat an'annular space E1 is left` between said` part E vand theexterior of the forward end of part A and the nozzle v E? (Figal 2)*r is provided: to' admit air? Orland lar opening E2 tothe bore B.

A third part F of the bodvof the burnerV is screwed 'over the part E and `'is arranged to leave betweenV the parts E and F an annular spacel F1 terminating forwardlyviin a circular opening .F2 lto thefbore B. 'Combustible gas or liquid 'hydrocarbons may be supplied through a nozzle F3 when desired under pressure or Iotherwise to-saicbspace lF1 andthence toftherfbore- B. Y

A jacket G is screwed on over the part F thereby formifng an annular 4chamber "G1 V throughfvvhich thefincom-ingair for iijec= tion through nozzle D is-passed for the ipu' ,pose of lhighly yheating such, air Von *its Way 'te said nozzle D. Y The air under pressure fis admitted to the leharfiber G1 `through the apertu-re-G2, passes laround y'the highly heated chamber G1 and outv through aperture G :into pipe pre-vided "with, fa valveHlfand thence throughfpipe H2 to 'thenozzle-D. F or convenience in assembling, the pipes 4'Hand H2ar'e threadedaftjtheir abuttingendsfand fthe colla-rd is screwed thereoverto make a good joint. Y,

The par-t F is provided with Aa lu'g K for attachment of the `'burner I'to Lits 'su'pport or mounting.

If desired liquid-V -fue'l--may be Keivn-I-ylc'ryecl instead `lof pulver-ized solid fuel as aforesaid. Referring" more ,particularly to AfF-igt, by Way o-f example, one arrangement :of mears for supplyi-ng pulverulent-'fuel tothe burner is illustrated. f o Y lIn this `alrrangement,- depending branch armsxL andM are screwed into bosses A2-A3 iprov'ided :on `the body fipart- A and fthe `pas-- sages L2 and M21 -in-fsaid branch farms communicate Withthe chamber. 'C Lthrough taf- :pered openings 'Ct-and C2 Which may if vdesired I.be provided:with Vinterchangeasbjle-xnozz-le's.. with apertures Yof idiffer'ent sizes *for `use according to the granular size of pulverulent fuel employed.Y Also lit f-i's 'preferable vto Yuse -ay nozzle with Ia larger aperture-for fpulverulentvf-uel'th-an 'When liquid fuel is:V employed. ScreWedoW-n `val-vesL2,and M2Vop'erating iln the Walls ofpipesfflfv andfM'arexpro-vided for Lthe purposeof controlling the'supplyof fuel through Lapertures L-1 and M1..

Semi-spherical suckers f N land :Qymounted lon the ends 'of larms'f'L and IM respectively, are .provided withl -ho'les N1y and `@lv Athrough AWfhich the pulverulent fuel (.oriflioluid fuel?) is sucked or fpa'ss'ed, l:and 4nozzles VN2 and '(92 permit a supply of airfCWhiehi mafybelheated lor fno't-)fto 'be drawnor' forced' under pressure 'therethrough toV lifter assist lin thjeusaid fuel'tothebu'rner. l

-The I'suckers -N and-0 are located respecvbreng ftivel-y in-boxesorcontainers P and Q, which V'are keptsubstan'tially full of ffu'el.

. The valve rods L2 and M2 are shovvnipr'ol through valve Hi fintowpifp'e H21and elfreneeite the 7nozzle E, `the maim invtefrter. As islrown in lligu-repulverulent lfnellv (or liquid fuel) lis vsupplied 'through thefsemispheniewl :suckers N and O through pipes L M tothe f -taperedfopenings *C1 ianfd lC2 ibythe' faction of nozzlefiand nozzles N2 land @2, Whichnaiy assist in 'the zlifting operation im .the suckers l Additional air or steam orlboth-wnder fpnessure vis admitted to the fbumer through they nozzle E2 *(Filgure :into the space Epmd thence `througlfl the' eir`cullar fopeningils fto the `lbore B. gCombostible :gasfor' iliquiidhgh drocarbons may be supplied to the-bur'ner *through the 'nozzley 3 (Figure 12j) into :space F2, :and thence tothe beireB.-y

gli `the construction illustrated in Figs. an L The iboss' 1R z is, provi-ded 'With fa forwardly `taperino lbore-into .which fthe* `:air injector Anozzle L is screwed le'avilng gan annular sage T which receives lliquid'ffueil throufh the dppostety disposed op'enings 2 to 'Which latter the'. `depending conduits U1 Aand U2 "respectively 5"(see` VFig. 16) :are =alt i :tache-l. Fllheilattergcarry attheiil-{lower ends liquid fuel 'for startingnean Lthe'nbe turned N5 voI-f and the burner lthereafiter fran Lupen" Athe fpulveruilent, o'r the :liquid fuel lor ibofth, Jas desired.

The :parts of -lthe pulvemlent fand the liqud 'fuel tfeedingide-visas:andtherelativeiarf rangement jo'f kthe..said parte @may be vari-eti vlargely 'as desired.v

1; An Finj ector burner comprising felongatel ebarrel .having lreeiand unobstrueted 5 Abore,- 'an airfiujeetorinozzlelocated ely-axially With the Shore Sat '-tle :rea'r'e'n'd thereof, la lp're'- fhea'ting chamber :in fthe uvall fof. lthe :burner 'for 'passing therethrough the gmain l supply `of air under pressure,means to conductthe l heated air from` said chamber to the injectory and means for supplying additional air un-v der pressure to the bore in advance of the main air supply.

2. An injector burner comprising an elongated barrel with a free and unobstructed bore .increasing in cross-'sectional area towards the nose end of the burner, an air injector nozzle arranged co-axially with the bore at the rear end thereof, a pre-heating chamber in the wall of the burner for the main air supply for said injector, fuel feeding means entering the sides ofthe bore towards the rear end thereof and arrangements for supplying additional air tothe bore in advance of the main air supply.`

3. An injector burner comprising an elongated barrel with a tapering unobstructed bore, an enlargement of the bore at the rear end thereof, an ai-r injector nozzle arranged co-axially with the bore to the rear wall of said enlargement, fuel feeding conduits entering the sides of said enlargement, an air heating chamber in the wall of the burner towards the front end thereof, means to ad-` mit air under pressure to-said chamber and to conduct the heated air from said chamber to the said injector nozzle and means for supplying additional air to the bore of the burner in advance of the main air supply.

4. An injector burner comprising an elongated barrel with a tapering unobstructed bore, an enlargement of the bore at the rear axially with the bore in the rear wall of said enlargement, fuel conduitsA entering said enlargement, an airV heating chamber in the wall of the burner towards the4 front end thereof, means to admit air under pressure to said chamber and to conduct thexheated `end' thereof, an injector nozzle arranged co- A air from said chamber to the said injector i nozzle, means for supplying additional air under pressure to the bore of the burner, and means for supplying liquid or gaseous fuel to the bore of the burner in advance of the main fuel supply. I

5. An injector burner vcomprising an elongated barrel with a vtapering unobstructed bore, having an enlargement at the rear end thereof, an injector nozzle co-aXial-with the bore in the rear wall of said enlargement, fuel conduits entering said enlargement and depending into receptacles for the fuel, induction devices on the lower ends of said conduits, lvalves controlling the inlet orifices from said conduits to the enlargement of the bore, a heating chamber in ther Wall of the burner towards the nose end thereof for preheating the incoming main Vair supply.v

under pressure, means to conductthe heated air from-said chamber to the injector nozzle, inlets to the', bore for additional air and means for supplying fuel to the bore in advance of the main fuel supply.

LUDWIGr GROTE. 

